You get get them really cheap on Amazon like $5 for 60 test I would recommend testing a week after your period till you get a positive. That will kinda give you an idea of what CD you O on then just test the week you get the positive after that. But it's nice cause it's positive the day you ovulate so no guessing or going off an app cause when I was testing my positive was a week before my app said I was supposed to ovulate
Once you figure it out it's a good app but the best way to tell when your ovulating is to get ovulation test they tell you the exact day your most fertile
@audreysmama, I like glow too but I dosen't tell me when i ovulate and this one does and tells me the exact date i just don't know how to use glow well